👉 Underskin is a medical term that refers to the skin that lies beneath the epidermis (the outermost layer of the skin) and contains cells, blood vessels, and nerves. It is often referred to as "the skin under the skin" because it covers all parts of the body except for the face and extremities. The underskin also includes the integumentary system, which is composed of hair, nails, sweat glands, and other structures that provide protection against external factors such as
